Atomic Structure Quiz

How many electrons are in the d sublevel of an atom with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d7?

How many electrons can occupy the 3p sublevel?

• 2

• 6

• 8

• 10

Which of the following represents the correct electronic configuration for phosphorus (atomic number 15)?

• 1s2 2s2 2p6 3s2 3p3

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p6

• 1s2 2s2 2p6 3s2 3p4

According to the Aufbau principle, electrons fill atomic orbitals of the lowest available energy levels before filling higher levels. Which of the following represents the correct order of filling for the 3d and 4s orbitals?

• 4s, 3d

• 3d, 4s

• 3d, 3s, 3p, 4s

• 4s, 4p, 4d, 4f

What is the correct electronic configuration for chromium (atomic number 24) according to the Aufbau principle?

• [Ar] 3d5 4s1

• [Ar] 3d4 4s2

• [Ar] 3d6 4s0

• [Ar] 3d5 4s2

How many electrons can occupy the 4d sublevel?

• 2

• 6

• 10

• 14

According to the Pauli exclusion principle, what is the maximum number of electrons that can occupy an atomic orbital?

• 1

• 2

• 4

• 8

Which of the following elements has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6?

• Uranium (U)

• Plutonium (Pu)

• Neptunium (Np)

• Thorium (Th)